Qunol Extra Strength Magnesium Capsules have high absorption§ compared to regular* magnesium. Magnesium is a mineral that participates in more than 300 reactions in the body and is critical to many bodily functions such as supporting muscle, bone and nerve functions*. One serving of Qunol's Extra Strength capsules provides 100% Daily Value of Magnesium. High Absorption§ Magnesium Glycinate buffered Delivers 420mg of Magnesium [100% of Daily value] Extra Strength Promotes Nerve, Bone and Muscle Health